Updated 3 November 2026

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How to send LinkedIn post engagers to n8n by webhook

Send the people who like and comment on LinkedIn posts to an n8n workflow by webhook, then route them to your CRM, Slack or outreach.

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💬Someone comments on a LinkedIn post

Alex Morgan · 2nd

Founder, Northpeak

Biggest mistake we made early on: buying static lead lists. Our reply rates tanked.

👍❤️💡87 reactions24 comments

Sophie Clark
Same here. We are rebuilding our outbound list this quarter.

Marcus Jones Great point.

🎯Cornersight turns them into a lead

Sophie Clark

Head of Growth, Brightline

✓ ICP match

💬Commented on the post

Sent to n8n✓

Why use n8n with Cornersight?

n8n lets you decide what happens to each lead after Cornersight finds it. Cornersight finds the engagers and checks them against your ideal customer profile. Your n8n workflow sends them wherever you work.

What does the webhook send to n8n?

Cornersight sends one POST per lead, event lead.detected, with the lead under data: jobTitle, company, country, linkedinUrl, postUrl, commentText, isIcp (true or false) and more.

How do I set up the n8n workflow?

The setup has four steps: an n8n Webhook trigger, a Cornersight source, the URL on that source, and a test.

1. In n8n, add a Webhook node as the trigger, set it to accept POST requests, turn on its Raw Body option, and copy its production URL. Without Raw Body, the signature check in the next section fails.
2. In Cornersight, track a profile, company page, post or keyword search.
3. On the Leads page, pick the source, open the table's + menu and choose Webhook. Paste the n8n URL into Endpoint URL, choose All leads or ICP only, tick Auto-add future matching leads, and save. Saving a URL the first time also sends the leads you already have.
4. Click Test next to the URL. n8n receives one sample lead marked event: test.

Can n8n check that the request came from Cornersight?

Every delivery is signed with HMAC-SHA256, so an n8n Code node can check the signature before the workflow runs. Compute HMAC-SHA256 of the X-Cornersight-Timestamp header, a dot and the raw body, with your whsec_ secret, and compare it with X-Cornersight-Signature. The method is in the API docs at https://app.cornersight.io/docs#webhook-security.

Can n8n pull leads instead of waiting for a webhook?

n8n can also call the Cornersight REST API with your API key, on a schedule. The API docs are at https://app.cornersight.io/docs.

Do I need my LinkedIn login?

No login is needed. Cornersight finds who engaged without your LinkedIn login or cookies. Nothing runs on your account.

Does Cornersight find emails?

We don't sell emails. Connect your own email finder (for example LeadMagic) and Cornersight finds emails for your ICP leads with your own credits.

What does it cost?

Cornersight costs 1 credit per lead, and Starter is $99 a month for up to 15,000 new leads. The 7-day free trial needs no card and covers 2 profiles, 2 posts and 2 keyword searches, at up to 250 leads each.

Works with your stack

REST API

FAQ

Is there an official n8n node for Cornersight?

No. Cornersight sends leads by webhook to any URL, and n8n receives them with its own Webhook node. n8n can also connect to the Cornersight MCP server.

Can I use Clay instead?

Yes. The same webhook can point at a Clay table. See [Send LinkedIn engagers to Clay].

Can I use Cornersight from Claude?

Yes. Cornersight has an MCP server at https://mcp.cornersight.io/mcp.